I have a problem with performance on my system, I have installed the nvidia binary drivers following the instructions from https://wiki.debian.org/NvidiaGraphicsDrivers. But everytime I try to play any sort of 3D accelerated game, I'm only getting about 1-3 frames per second.

It did actually work with acceptable performance when i first installed nvidia-drivers, but then I did apt-get update & apt-get upgrade a day layer and it no longer works. Even with reinstalling nvidia-driver.

You're running Debian testing, aka Buster. You should make this clear from the very start.

Look in your apt history to see what updated to cause these problems. These are the last two updates to Nvidia in Buster that haven't made it to stretch-backports (which version works fine in MX Linux, BTW)

DKMS will build the nvidia module for your system, via the nvidia-kernel-dkms package.Just restart your system to enable the nouveau blacklist. (no need to manually blacklist it)There is no need for a xorg.conf or to install/run nvidia-xconfig anymore.

It's been like this for years (sid), but, stable is a different ballgame and is behind (not saying that as a bad thing), buster should help on this

There is a "global" default configuration in arch, debian that is now in